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A new cobalt(Ⅱ) polymer with quasi-rectangular cavities,[Co(L)2(TP)·H2O]n 1 (L= 1-butylbenzimidazole,TP = terephthalate ion) has been prepared by means of self-assembly of 1-butylbenzimidazole,terephthalic acid and Co(NO3)2·6H2O.The structure of 1 was characterized by X-ray diffraction analysis.In the crystal packing,2-D supramolecular layers are formed via π-πstacking interactions.The fluorescence emission spectra of L and 1 are described.